Knockout is a member of the Decepticons, notably their doctor in Transformers Prime, he ultimately betrays the Decepticons and joins the Autobots in Transformers Prime Predacons Rising.
"You all are Primes"-Optimus Prime
"Well I never had the best role-models" Knockout's response.
After the Autobot's final victory over Unicron and Megatron, Optimus Prime was permanently fused with the All Spark, which made it impossible for a new Prime to be created if he was destroyed, Optimus sagely states that all members of Team Prime are now Primes, this means the bulk of the cast are now considered a Prime, Arcee Prime, Bulkhead Prime, Wheeljack Prime, Bumblebee Prime, Ratchet Prime, Smokescreen Prime, and surprisingly Knockout Prime.
Knockout was not very excited by his new role as a Prime, though he did take his role as the emissary of the Decepticons very seriously, attempting to talk his allies into joining with the Autobots.
Knockout's hero turn had been hinted in the last episode of Transformers Prime where he states "I'm always on the winning side" Knockout follows up this statement in the movie, where he attacks Starscream and states "Now do you believe me?, I'm always on the winning side."
Transformers Prime: Beast Hunters: Predacons Rising
The final chapter of the Transformers Prime series, a direct to DVD movie slated for release in October 2013.